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The second richest source of vitamin D is lard. No, you didn't read that wrong — lard.
Lard ranks #18 on our list of the top 22 foods richest in cholesterol, and is over four times richer in vitamin D than its nearest competitor, herring.
Granted, the pigs need to be exposed to sunlight to generate vitamin D.

Even food no longer provides as much Vitamin D as it did 100 years ago.
For example, in 1900, pie crust was made with lard from pigs raised outdoors.
Back then, just one piece of a double-crust pie provided 2000 IU of Vitamin D
Today, pie crust is made from vegetable oil or shortening.
How much Vitamin D? Zero.